At Jeannette Specialty Glass, our refractors and reflectors
are made from JSG's own borosilicate glass formula. Our famous
"Hard Roc" glass is thermal shock and strain tested to meet your
most demanding applications.

High Volume or Custom Glass Production

If you have a custom
order or a large order, JSG is ready to meet your needs. We
have the capacity for large production runs as well as the
master craftsman and experienced glass technicians to handle any
order. Contact us today to
learn more.